Physical Properties of Technetium and Francium
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Shiny Gray
  
NA
  
Luster
NA
  
NA
  
Hardness
  
  
Speed of Sound
16,200.00 m/s
  
1
Not Available
  
Optical Properties
  
  
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available